Monkey-wrench.



G. SZILAGYI.

MONKEY WRENCH.

APPLICATION FILED APR. 17. 191s( Patented Apr. 28, 1914.

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@Mr/MJA NTED STATES Arnr nro enza sziLAGYI, 0F GARY, INDIANA, AssIGNoR0F ONE-HALF To JOHN BALI, or GARY, INDIANA.

MONKEY-WRENCH.

noemen,

Specification of Letters Patent.

Patented Apr. 28, 1914.

To all iii/om it may concern.'

Be it known that I, GZA SZILGYI, a subject of the Emperor ofAustria-Hungary, and a resident of the city of Gary, county of Lake, andState of Indiana, have invented certain new and useful Improvements inMonkey-lVrenches, of which the following is a specification.

My invention relates to improvements in monkey wrenches and has for itsobject the provision of such a wrench which is provided with improvedmeans for quickly adjusting the movable aw thereof.

The invention consists in the combinations and arrangements of partshereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawing forming a part of this specification, and in which- Figure l isa side view of a wrench embodying my invention, Fig. 2, a top plan viewcorresponding to Fig. l, and Fig. 3, a section taken on line .cc-:c of Fig. l.

The preferred form of construction as illustrated in the drawingcomprises a shank l in the form of a flat metallic strip which isprovided at one end with a suitable handle 2 and at the other end with ahead 3 fixed the-reto and projecting from each side thereof to formfixed jaws 1i. A movable head 5 is perforated centrally to slide onshank l and also projects from each side thereof to form movable jaws Gcooperating with the fixed jaws Ll to engage a nut, as will be readilyunderstood. A locking arm 7 is pivotally mounted at each side of head 5and is provided at its free end with teeth S adapted to engagecorresponding teeth 9 provided in the corresponding edge of shank l. Athumb piece or operating member l0 is slidably mounted on shank l and isprovided with buttons or projections ll adapted to facilitate operationthereof. This thumb piece carries pivoted links 12 connecting it to thefree ends of arms 7 on each side of shank l, said links being pivotallyconnected with said thumb piece by means of a common rivet 13 whichextends through a slot le in shank l. Each of the arms 7 carries a stoppin l2 adapted to limit the swing of the corresponding links l2 and thuspreserve the operative relation between the parts.

The arrangement is such that when movable head 5 approaches thumb piece10, or

vice versa, the free ends of arms 7 are drawn into engagement with thetoothed edges of shank l with the outer rounded edges of arms 7 engagingthe converging surfaces l0 in thumb piece l0 locking the device inoperative condition. Thus the greater strain upon either of the jaws 6tending to force it away from the corresponding jaw 4L the tighter theteeth 8 will be engaged with the teeth 9. When it is desired toadjustthe jaws 6, all that is necessary is to mo-ve said thumb pieceaway from said jaws or vice versa, whereupon the teeth in arms 7 will bedisengaged from teeth 9 by action of links l2, as will be readilyunderstood. This constitutes a simple and effective construction for thepurpose and will be found to be durable and highly efficient in use.

lVhile l have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modiiications as come within the scope of the appendedclaims.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

l. A wrench comprising a shank having teeth thereon; a fixed jaw on saidshank; a movable jaw slidably mounted on said shank; an arm pivoted atone end to said movable jaw and its other end provided with teethengaging the teeth of said shank; a thumb piece slidably mounted on saidshank and operatively connected with said arm; and means carried by saidthumb piece adapted to facilitate locking of said teeth together,substantially as described.

Q. A wrench comprising a shank having teeth thereon; a fixed jaw on saidshank; a movable jaw slidably mounted on said shank; an arm pivoted atone end to said movable jaw and its other end provided with teethengaging the teeth of said shank; a thumb piece slidably mounted on saidshank and having a portion adapted to engage the outer edge of thetoothed end of said arm when said teeth are in mesh; and a linkconnecting said thumb piece with said arm, substantially as described.

3. A wrench comprising a shank; a fixed to :mld movable jaw,substantially as cle- 1G scribed.

l'n testimony whereof l have signed my nume 'to this specification in.ille presence of two subscribing witnesses.

Witnesses JOSHUA R. H. OTIS, ARTHUR A. OLSON.

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